package org.springblade.modules.resource.utils;


import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.*;

/**
 * 文件上传工具类
 *
 * @author jeefast
 */
public class FileUploadUtils {


	/**
	 * 默认大小 50M
	 */
	public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

	/**
	 * 默认的文件名最大长度 100
	 */
	public static final int DEFAULT_FILE_NAME_LENGTH = 100;

	/**
	 * 默认上传的地址  String filePath="E:/temp/wireless/uploadPath/upload";
	 */
	private static String defaultBaseDir = "E:/temp/wireless/uploadPath/upload";

	private static int counter = 0;

	public static String getDefaultBaseDir() {
		return defaultBaseDir;
	}

	public static void setDefaultBaseDir(String defaultBaseDir) {
		FileUploadUtils.defaultBaseDir = defaultBaseDir;
	}

	/**
	 * 以默认配置进行文件上传
	 *
	 * @param file 上传的文件
	 * @return 文件名称
	 * @throws Exception
	 */
	public static final String upload(MultipartFile file) throws IOException {
		try {
			return upload(getDefaultBaseDir(), file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		} catch (Exception e) {
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 根据文件路径上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file    上传的文件
	 * @return 文件名称
	 * @throws IOException
	 */
	public static final String upload(String baseDir, MultipartFile file) throws IOException {
		try {
			return upload(baseDir, file, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION);
		} catch (Exception e) {
			throw new IOException(e.getMessage(), e);
		}
	}

	/**
	 * 文件上传
	 *
	 * @param baseDir 相对应用的基目录
	 * @param file    上传的文件
	 * @return 返回上传成功的文件名
	 * @throws IOException 比如读写文件出错时
	 */
	public static final String upload(String baseDir, MultipartFile file, String[] allowedExtension)
		throws Exception {
		int fileNameLength = file.getOriginalFilename().length();

		if (fileNameLength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
			throw new Exception("文件名称太长");
		}
		//文件大小校验
		assertAllowed(file, allowedExtension);
		//重新命名文件
		String fileName = extractFilename(file);

		File desc = getAbsoluteFile(baseDir, fileName);
		file.transferTo(desc);

		return getPathFileName(baseDir, fileName);
	}

	/**
	 * 编码文件名
	 */
	public static final String extractFilename(MultipartFile file) {
		String fileName = file.getOriginalFilename();
		String extension = getExtension(file);
		fileName = DateUtils.datePath() + "/" + encodingFilename(fileName) + "." + extension;
		return fileName;
	}

	private static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException {
		File desc = new File(uploadDir + File.separator + fileName);

		if (!desc.getParentFile().exists()) {
			desc.getParentFile().mkdirs();
		}
		if (!desc.exists()) {
			//desc.createNewFile();
		}
		return desc;
	}

	private static final String getPathFileName(String uploadDir, String fileName) {
		//uploadDir==D:/temp/file/uploadPath/upload/model
		//fileName==2021/08/03/ef5f8d331ab3b1f1d83af1b8fbae938a.jpg
		return uploadDir + "/" + fileName;
	}

	/**
	 * 编码文件名
	 */
	private static final String encodingFilename(String fileName) {
		fileName = fileName.replace("_", " ");
		fileName = Md5Utils.hash(fileName + System.nanoTime() + counter++);
		return fileName;
	}

	/**
	 * 文件大小校验
	 *
	 * @param file 上传的文件
	 * @return
	 */
	public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
		throws Exception {
		long size = file.getSize();
		if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
			throw new Exception("DEFAULT_MAX_SIZE / 1024 / 1024");
		}

		String fileName = file.getOriginalFilename();
		String extension = getExtension(file);
		if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension)) {
			if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION) {
				throw new Exception("错误");
			} else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION) {
				throw new Exception("错误");
			} else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION) {
				throw new Exception("错误");
			} else {
				throw new Exception("错误");
			}
		}

	}

	/**
	 * 判断MIME类型是否是允许的MIME类型
	 *
	 * @param extension
	 * @param allowedExtension
	 * @return
	 */
	public static final boolean isAllowedExtension(String extension, String[] allowedExtension) {
		for (String str : allowedExtension) {
			if (str.equalsIgnoreCase(extension)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * 获取文件名的后缀
	 *
	 * @param file 表单文件
	 * @return 后缀名
	 */
	public static final String getExtension(MultipartFile file) {
		String extension = FilenameUtils.getExtension(file.getOriginalFilename());
		if (StringUtils.isEmpty(extension)) {
			extension = MimeTypeUtils.getExtension(file.getContentType());
		}
		return extension;
	}

	///////////////////////////////////////////////////多线程调用/////////////////////////////////////////////////////////////////////////////////

	public static final String uploadThread(String baseDir, InputStream inputStream, String fileName, long size, String contentType) throws Exception {
		int fileNameLength = fileName.length();
		if (fileNameLength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH) {
			throw new Exception("文件名称太长");
		}

		//文件大小校验
		if (DEFAULT_MAX_SIZE != -1 && size > DEFAULT_MAX_SIZE) {
			throw new Exception("DEFAULT_MAX_SIZE / 1024 / 1024");
		}

		String extension = FilenameUtils.getExtension(fileName);
		if (StringUtils.isEmpty(extension)) {
			extension = MimeTypeUtils.getExtension(contentType);
		}

		if (MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION != null && !isAllowedExtension(extension, MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION)) {
			if (MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION == MimeTypeUtils.IMAGE_EXTENSION) {
				throw new Exception("错误");
			} else if (MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION == MimeTypeUtils.FLASH_EXTENSION) {
				throw new Exception("错误");
			} else if (MimeTypeUtils.DEFAULT_ALLOWED_EXTENSION == MimeTypeUtils.MEDIA_EXTENSION) {
				throw new Exception("错误");
			} else {
				throw new Exception("错误");
			}
		}

		//重新命名文件
		fileName = DateUtils.datePath() + "/" + encodingFilename(fileName) + "." + extension;
		String outPath = baseDir + File.separator + fileName;
		//获取输出流

		int dirLastIndex = outPath.lastIndexOf("/");

		String currentDir = outPath.substring(0, dirLastIndex);
		File outFile = new File(currentDir);

		if (!outFile.exists()) {
			outFile.mkdirs();
		}

		OutputStream os = new FileOutputStream(outPath);

		byte[] bts = new byte[1024000];
		//一个一个字节的读取并写入
		while (inputStream.read(bts) != -1) {
			os.write(bts);
		}
		os.flush();
		os.close();
		inputStream.close();

		return getPathFileName(baseDir, fileName);
	}


}
